My NISMO does bog down as well when the outside temp is above 83F (oil temp approaching 230F). This happens when attempting to accelerate from a stop. In fact it is so bad I sometimes feel that the engine dies. I did speak to the service manager at my dealership about it and he said to bring it in on a hot day to so they can try to and figure out what is happening. Planning on doing this I was going to hold off on getting an oil cooler until they have a chance to look at it.
It is pretty frustrating though.
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